單項選擇題In a purifier, the interface between the liquid seal and the oil should be positioned as close as possible to ().

A.the outlet of oil
B.the outlet of water
C.the bowl periphery
D.the center of bowl


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1.單項選擇題In a purifier changing to a gravity disc with larger hole diameter will move the interface towards the ().

A.bowl periphery
B.bowl center
C.upper surface
D.lower surface

2.單項選擇題In a marine diesel engine the oil sump is ().

A.just below the crankcase
B.the oil cup for the exhaust valve
C.the pan for collecting drain fuel oil
D.oil circulating pump

4.單項選擇題In a four-stroke engines the camshaft rotates at ().

A.half the engine rotational speed
B.twice the engine rotational speed
C.the engine rotational speed
D.four times the engine rotational speed

5.單項選擇題In a diesel engine, fuel must be broken up into a spray of fine droplets to ().

A.increase its quality
B.obtain complete burning
C.reduce its weight
D.all of the above